diff options
| -rw-r--r-- | activemodel/lib/active_model/type/decimal.rb | 12 | ||||
| -rw-r--r-- | activemodel/test/cases/type/decimal_test.rb | 7 |
2 files changed, 17 insertions, 2 deletions
diff --git a/activemodel/lib/active_model/type/decimal.rb b/activemodel/lib/active_model/type/decimal.rb index d19d8baada..11ea327026 100644 --- a/activemodel/lib/active_model/type/decimal.rb +++ b/activemodel/lib/active_model/type/decimal.rb @@ -29,12 +29,12 @@ module ActiveModel end end - scale ? casted_value.round(scale) : casted_value + apply_scale(casted_value) end def convert_float_to_big_decimal(value) if precision - BigDecimal(value, float_precision) + BigDecimal(apply_scale(value), float_precision) else value.to_d end @@ -47,6 +47,14 @@ module ActiveModel precision.to_i end end + + def apply_scale(value) + if scale + value.round(scale) + else + value + end + end end end end diff --git a/activemodel/test/cases/type/decimal_test.rb b/activemodel/test/cases/type/decimal_test.rb index 353dbf84ad..1950566c0e 100644 --- a/activemodel/test/cases/type/decimal_test.rb +++ b/activemodel/test/cases/type/decimal_test.rb @@ -52,6 +52,13 @@ module ActiveModel assert_not type.changed?(5.0, 5.0, '5.0') assert_not type.changed?(-5.0, -5.0, '-5.0') end + + def test_scale_is_applied_before_precision_to_prevent_rounding_errors + type = Decimal.new(precision: 5, scale: 3) + + assert_equal BigDecimal("1.250"), type.cast(1.250473853637869) + assert_equal BigDecimal("1.250"), type.cast("1.250473853637869") + end end end end |